Can I get some suggestions please? I am thinking that it's time to do some more practicing and learning. I have been playing bass for years (nearly 20) and before that guitar, so I don't need something for a beginner. I wouldn't consider myself a great bassist though. I'm largely self taught. What I am after is book + CD or DVD that can help get more in depth at rock bass lines (grooves/licks/chops) because where I mostly play I need to be able to pretty much improvise a line for a song on the spot and then play it. Also, I have never slapped, and would like to learn, so a decent intructional designed for somebody who plays bass OK, but rush too quickly into really complex slap stuff would be great too. Any suggestions for the best ways to fill what I am looking for?

Thanks

Basses: Wasburn Status 4, Fretless 4 made from parts, Fretted through neck 5 made by me
Amp: Eminar bass 400 into home made cab with JBL 15"